Apparatus for setting the sights of guns.



PATBNTED OCT. 24, l905.

G. FORBES. APPARATUS FOR SETTING THE SIGHTS 0P GUNS.

APPLICATION FILED MAR.31, 1905.

vellum-411ml 1.

' PATENTED 001 124, 1905.

SHEETS- SHEET 2.

' G. FORBES.

APPARATUS FOR SETTING THE SIGHTS 0F GUNS. APPLIGATION FILED MARJI, 1905.

Q kwm w N N wk b IllllllllllllllllIll |||II||I|I FATE NTED OCT. 24 1905. G. FQRBES. APPARATJS FOE, SETTING THE SIGHTS 0F GUNS APPLIQATION FILED MAR. 31, 1605.

7 SHEETS-SKEE1 3.

PATENTED OUT. 24, 1965.

G. FORBES. APPARATUS FOR SETTING THE SIGHTS 0F GUNS. APPLICATION FILED mn.a1, 1eo5.

PATENTED OUT. 24, 1905.

G. FORBES.

APPARATUS. FOR SETTING THE SIGHTS OF GUNS.

APPLICATION FILED MAR. 31, 1905.

7 SHEETS-SHEET 5.

No? 802,929. PATENTED OCT. 24, 1905.

G. FORBES.

APPARATUS FOR SETTING THE SIGHTS 0F GUNS.

APPLICATION FILED MAR.31,1905.

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PATENTED OCT. 24, 1905.

G, FORBES. I APPARATUS FOR SETTING THE SIGHTS OF GUNS.

7 SHEETS-SHEET 7.

APPLICATION FILED MAR. 31, 1905.

gran T orrron GEORGE FORBES, OF WESTMINSTER, ENGLAND. APPARATUS ion sea-nae. THE SIGHTS oF sums.

. Specification. of Letters Patent.

Patented Oct/24, 1905. 7

Application filed March 31, 1905. Serial No. 253,160

To all whom it may concern:

Be' it known that I, GEORGE FORBES, fellow of the Royal Society, a subject of the King of Great Britain, residing at 34 Great George street, in the city of Westminster, England,

have invented certain new and useful Improve-- ments in Apparatus to be Used in Setting the.

Sights of. Guns, of which the following is a specification. A Q

At the present time when the distance of the target is known'we have no accurate knowl; edge of the angle of elevation at which to set the gun. This depends notonly on the distance, but also upon the resistance of the air, which varies with its density, and upon the'm'uzzlc velocity, which varies'with the temperature of the cordite and the wear of thegun and the rate'at which the gun and target are moving relatively to each other. Theelevation, therefore, can only be ascertained by lengthy calculations, and consequently it. is practically necessary to always fireone or more sighting- Shots from a ranging-gun. In order to overcome these difliculties, I modify themethod of sighting guns, and I combine with a range-finder such as is described in the specification of my patent dated the 27th of May,

1902, No. 701,190, a deviceforming thesubject of this invention, which may be called a 3 sight-setter or range-corrector, founded 4 finder and its carriage to a larger scale.

5 hand end of it to 'a still larger scale.

upon certain laws which I have discovered regarding the corrections to elevation caused by variations in muzzle velocity and air resistance. I

Figure 1 is a sectional elevation showing in its most complete form the arrangement I adopt for a barbette-gu'n, the range-finder being seen'inend elevation. Fig.2 is a rear elevation, and Fig. 3 a plan, of the range- Fig. 4: is a sectional elevation, and Fig. 5 a plan, of the range-finder carriage. Fig. 6 is a horizontal section of the middle of the range-- finder, and Fig. 7 is .a transverse section. Figs. 4, 5, 6, and 7 are toa still larger scale. Fig. 8 is a sectional elevation, and Fig. 9 is a plan, to a larger scale than Fig. 1, of the sighting apparatus of the'gun F, Fig. l; and Fig-F10 is a sectional elevation of the left- Fig. 11

is a side elevation of a modified arrangement. Fig. 12 is a sectional elevation, and Fig. 13 is a part plan of another modification.

The range-finder tube A is, say, forty feet long and is free to turn in roller-bearings B, carried by a frame consisting of four rods or tubes B, braced together by rings B and supported bya central sleeve Bf. The rangefinder has fixed at its ends a pair of Prandl prisms A, as in the range-finder described in my specification No. 701,190; but in order-to obtain an erect image with astronomical eyepieces I substitute for the two Prandl prisms fixed: at the middle of the tubea pair of prisms A", such as are described in the specification '-of my patentdated the 12th day of May, 1903,

No.'727,776, having a pair of transmit-tingfaces and a pair of internally-reflecting faces,

,the faces of each pair being'at right angles to each other and at an angle of forty-fivedegrees to the line of intersection of the other'pair. The balloons also at the foci-of the eyepieces A are fixed instead of movable, the image of the target being brought to the image of the balloons by turni ng a pair of thin prisms A between the prisins A and A as in my British specificationNo. 4,258 of 1903. The prisms A are fixed in a part tube A free to turn in the tube A. For this purpose the tube A has around its .outside a cam groove (not shown) with which a pin Alon the nut Aengages. The nut A is on a screw A and the camgroove is so formed that at all ranges each turn of the screw moves the image of the target the same distance. A represents the object glasses of the telescope, and A represents its eyepieces. The sleeve B carrying the range-finder, is mounted on a column C on a carriage C, driven by a motor C on rails 0 round the top. The motor C is a constant-speed electric motor driving the disk ,0, resting on a friction-wheel C fixed to the spindle of a worm U, gearing with a worm-wheel G on whose spindle is fixed a worm C, gearing with a worm-wheel on a shaft whichalso has fixed to it a toothed wheel.

0", gearing with a toothed wheel C, gearing with a circular rack C. to move in a circular guide (3 and has fixed to its under side a rack C gearing with a pinion .on the wheel U By turning this wheel the motor is traversed in its guide, andthe point of contact of the friction-wheel C with the disk 0* is moved toward and away from the center of the disk. In this way the speed of the train of gearing and of the carriage (J can be varied and reversed. The range-finder is kept roughly directed on the target by the motor C? and is ac "sted by the observer in azimuth by means of the worm The motor is free and worm-wheel B, Fig. 4, and in elevation is made under the present application either to this form of range-finder or the method of supporting and directing it, and although this form very convenient for the present purpose any other form may be employed in which there is a part moving in accordance with the distance of the object viewed.

The image of the balloons and the image of the target are made to coincide in spite of any change of range bythe constant-speed electric motor D, driving the disk D, against which a friction-wheel A on the shaft of the screw A rests. The motor D can be moved to and fro in guides D by a screw D turned by the observer through bevel-gear by a wheel D*. By movin the motor D the position of the point of contact of the disk D and wheel A is varied, so that the screw A can be driven in either direction at any desired speed. Connected to the end of the shaft of the screw A is a flexible shaft A, which is also connected to and drives the vertical shaft E, whose lower end carries a pin-wheel E, which drives, through an endless perforated steel band E the pin-wheel E fixed to the vertical shaft E, passing through the roof of the turret in a line with the pivot about which the turret turns.

N is a flexible shaft fixed to the end of the shaft 1 1* and communicating the motionto the sighting apparatus hereinafter described.

G G are two guide-plates rigidly fixed together and to one of the trunnions l of the cradle in which the gun recoils. H is a slide which can be moved to and fro in guides between the plates G by a screw H 3nd handle P1 Worked by the si ht-setter, The slide H is provided with hearings to re ceive trunnions fixed to a column J, on which the tube K of the telescopic sight is free to turn.

K is the object-glass of the telescope. K represents its eyepieces of different power, and K represents prisms to deflect the enter ing ray in the well-known manner.

The column J has rigidly fixed to it a tube J, having inside it a radius-bar L, on which it is free to slide.

L is a link pivoted to the guide bars G and to the radius-bar L, so that the latter is prevented from moving endwise.

The telescope-tube K carries a link K, ccnnected to the tube J" by a set-screw J", by turning which the telescope-tube K is slightly turned upon the column J to correct for deflection.

The end of the radius-bar L carries a ball L adjustable by a set-screw L The ball L rests on a wedge M, and thus supports the telescope. The effect, therefore, of turning the screw H is to vary the distance of the support from the trunnionsof the telescope. r v r The wedge M is pivoted at M to a sllde N,

which is moved to and fro between the guideguide-plate G.

ceases shafthl and resting upon the half-nut it, fixed to the guide-plate G. This screw is pivoted at N, and when desired it can be lifted out of the half-nut, and the slide and wedge can then be moved rapidly by hand for great changes of range. The rear end of the wedge M rests upon a horizontal row of balls 0 on a table forming part of the slide N. The

under side of the wedge has fixed to it a lug in, which is embraced by a fork O, fixed to the vertical shaft 0 which alsohas fixed to it a fork O embracing pins P, fixed to a sleeve P on the screw N. The'sleeve P is not screw-threaded, but it is slotted to receive a friction-wheel Q, working as a nut on a quick-threaded portion of the screw N.

R is dish resting on the friction-wheel Q, and E is a worm-wheel fixed on its spindle and gearing with a worm R fixed to the spindle of a worm-wheel R gearing with worm R fixed to the spindle of a constant-speed electric motor R When the screw N is stationary, the motor R screws the wheel Q along it until it reaches its mid-position, as shown,whereupon it ceases to revolve. When the screw N is turning, it causes the wheel Q, to move laterally until it reaches such a distance from the center of the dish R that it is driven by the motor R and disk R at the same speed as the screw N, whereupon its lateral movement ceases. The wheel Q, during its lateral movement carries the sleeve P with it, so turning the shaft whichturns the wedge M about its pivot M. There is a blank space at each end of the quick-threaded portion of the screw N", so

that when the Wheel Q comes near the edge 1 rod R, which is supported by a standard N fixed to the slide N, and: is adjustably'held by a set-screw N. The motor has .upo'n itascale R and the slide N a pointer'll by which the position of the motor relatively to the slide can be read. The sleeve P also carriesascale P and the motor a pointer B, so that the position of the sleeve relatively to the motor can be read. The slide N has fixed to its pin N engaging with a cam-groove in a cylinder S, free to turn'in bearings S, fixed to the The cylinder has upon it a scale S divided into hundreds of-yards, short or over, and a nut H on the screw H carries a pointer H. also carries a pointer H which moves along the scale G on the plate G, indicating muzzle velocities.

The central vertical section of the wedge M is a curve of which the abscissee are propor- 5 bars (1 by the screw N, driven by the flexible tional to the ranges, while the ordinates give The slide'H on the screw H.

" ceases to the gun the corresponding elevation required fora stationary target at those ranges under normal conditions. Other ertical sec" tions of the wedge through the pivot M are similar curves for targets approaching and receding'at different rates. These curves can readily be drawn from the range-tables, which are usually prepared for each gun or class of gun. A simple way of constructing the wedge is to cut out; number of these curves from thin sheet metal and fix them in proper order in vertical planes radiating from a point. The spaces between the sheets are then filled up with plaster-of-paris or the like, and the surface of the plaster between the tops of the plates is smoothed off. The model of the wedge formed in this Way is then reproduced in hard metal by any ordinary method, such as electrodeposition or castin Illet/wd of US'iNQ Ldc Appm'atmw.

Before going into action two corrections namely, those for muzzle velocity and density ofthe'air-should' be made.

llfiazeh 9)c/0cit 1/.AS is well known,this depend-son the Weight of the charge, the temperature of the cord-ite of which iii-consists, and the amount of wear to which the gun has been subjected; When thesefactorshave'been ascertained, the approximate muzzle velocity is determined by tables. The ollicer in charge of the gun turns the wheel H until the pointer H comes to the proper tigu re on the scale (1%.

Air Zen-st1 '.ll1is may readily be determinedeither (1) by thermometer, barometer, and hygrometer, or (2) byweighing a hollow sphere-of thin glass, preferably mounted as part of a steelyard, or (3) neglecting moisture by the height of liquid in a vertical tube dipping into liquid in a bottle hermetically sealed at the neck. Different air densities have the same effect as change of range duringtlight, arid therefore the necessary correction is made by turning the wedge l l about its pivot M. This is done bythe officer in charge of the gun by loosening the screw N and moving the motor until the proper figure on the N. This has the client of shifting. the dish it relatively to the wheel Q, or, in other words, altering the normal or mid position of the wedge. The motor when thus brought to its proper position is again clamped by the screw N.

Raoige-fimlma-lt is the duty of the ofiicer in charge of the range-finder to keep the target in the field of view and to so regulate the speed of the screw A, by shifting the motor D by means of .the handle if, as before described, that the image of the balloons coincides with that of the target. If this be done, then since the screw N is turned, as before described, at the same speed asthescrew A it follows'that the wedge M is automatically horizontal instead of vertie n1 such a. spects thearrangementis similar to thatabovc uoved to and fro longitudi'nallh 1 mannerthat it is always in its proper position corresponding to the range, whatever that may be. As explained above, also any change in the speed of revolution of the screw N turns the wedge M more or less about its pivot M, and in this way the curve of the wedge corresponding to that rate of changeof range is automatically brought beneath the ball L r'l'lil/tliltj. It follows from what has been said above that the oilicer in charge of the gun only hasto use his judgment in allowing for the effect of the wind, and he corrects for this and for the known deflection at the different ranges by turning the screw J If new the gun is elevated and trained so as to direct the telescopic sight onto the targehfgthe projectile cannot fail-to hit, provided tl'ie preliminary adjustments have been corrlttly made. If, however, the projectile falls short of or passes over the target, which it will do if a mistake has been made in calculating the muzzle velocity, the officer in charge of the range-tinder or another. shot-spotter. in"- t'ormsthe oliicer in charge of the gun of the amount of the error, whereupon he turns the. wheel H until he brings'the pointer H opposite the proper figure on the short-andover scale S and thereby makes the required correction. As the amount of these correc tions varies with the range, they are shown by curved lines on the surface of a cylinder which is rotated by the longitudinal movement of the wedge.

The vertical shaft E may have fixed to it a second pin-wheel driving an endless-fictiorated band running roundthe ship and conveying the movement of the range-finder to another gun or to several guns. in fact, all the guns in the ship may in this manner be controlled simultaneously by a single rangefinder. The iiuion of the band should be made so great-say six inches, to represent one hundred yards range so as to avoid all trouble from stretching, temperature, and backlash.-

Fig/11 shows a modilied arrangement in which the sight-setter in place of being supportedby the trunnion of the cradle is carcradle, so that it turns with the latter. In

this arrangement the guide-plates (ii are fixed to the false trunnion and are vertical instead of horizontal, as before, and the slide N and i the parts connected to it are counterbalanced by the weight U. The telefiseope-tube K is l In other reabout a horizoiital gain V which is:

desixihed and the parts are marked with the same letters.

Fig. 12 shows a somewhatd i meat which, however, works ncr, andFig. i3 is a part plan of she same.

in this case the telescope-tube is pivoted at V inside a tuboV. The tube" V is pivoted an ans than t arrange gle of about one onohali zlegrees a right an; e to the bore of the gun pensa'tc for drift, the final corrections: ferences of rift at side wind being: by earning the telescope about end, which isot she- 'n. to block V 10 move on gnidcsfixed so the plate. 5:1: i

shown by won on the scale (9 of the points Ed to the tune V.

block and tube VT are movedv to and fro e "W on the tube V- by the sleeve iv, and i d froby tnescrew lllwl c. plate x scope on ball X, carried by an arm X, free to move nong a guide formed in the bracket l ved "to the plate G. The motor 1% is also carrot. b the bracket G and can be moved to and fro along it to make the correction for air density by means of the screw and wheel Y. The spindle of the motor R carries a 4""; H, which runs in contact with a friction-wheel Q, carried by the arm X and working as a not on the quick-threaded screw 71, which has fixed to it a worm-wheel Z, gearing with the Worm Z on the flexible shaft 2 which is driven by bcvel-gear Z from the screw N. in this manner the ball X, on which the wedge is supported, is caused to traverse from side toside, according to the movement of the target, producing an exactly similar result to that obtained by the lateral movement of the wedge beneath the ball L, as described in the first arrangement.

Although I have described the range-corrector as being fixed "to the cradle of the gun, this is not essential. identically the same instrument may be used when it is entirely independent of the gun for calculating the proper elevation. In this case all that is required is a circle or other means for reading the angle between the guide-bars G and the column J, or the radial bar L may be replaced by a graduated vertical rod resting on the wedge and free to move up and down in stationary guides. 'lfhe screw H may also instead of being automatically driven by the in imilar man-- con dih 'erent. ranges and for oi" set-screw at its rear The pin V 18 fixed The wedge teleset for muzzle velocity,

jec'

by theofiicer in chm-goof the gun in accords and rates of change given (3 finder, or allmotors l andthe instrument be change of range dnringthe fiightof the pro-* curves of di'rierent mangle velocities.

in place of a. Wedge i may employ a rotatinn; cam-surface; but -l-l1lS is not usually de enable.

1 wish it to be understood that the term rangeiinderused Inthe following claims is not intended to include a telescope or tclescenic sight at a known height shove the ob gcct aimed at and whose range or depression therefore indicates the distance of the object. By variable-speed motor mean either motor whose speed can be varied or a constant speed motor provided with variable-speed also wish it to be understood that i am aware that cams or curves have before been proposed for determining the proper elevation of guns and thati make no broad claim to them; but

i declare that what I claim is* 1. The combinationoi a range-finder hair ring in it a part which moveswith changes of the distance of the object viewed a range-corrector, and means for operating the rangecorrectoi from the moving part.

2. The combination of a range-finder having in it a part which moves with changes of the distance of the object viewed, and a va" riable-spced motor driving the moving part.

3. The combination of a range-corrector, and a variable-speed motor operating it.

4. The combination of a range-finder having in it a part which moves with changes of the distance of the object viewed, a variable speed motor driving the moving part,-a rangecorrector, and means for operating the rangecorrector from the moving part.

5. The combination of a range-cor'rector, consisting of a wedge having a curved sur face, and means for moving the wedge longi tudinally in a straight line.

6. The combination of a range-corrector, consisting of a wedge having a curved. surface, and means for turning the wedge Pbont an axis at right angles to its edge.

7. The combination of a range-corrector,

consisting of a wedge having a curved surface,

1 edge, a pivot arent in and means for and away from the a sight supported by which the sight is ffl moving the wedge [1; Bot.

8. The combination of a rangecoi'rcotor,

consisting of a wedge having a curved surface, a sight, a pivot about which the si ht is free to turn means for moving the we ge toward and away from the pivot, and an arm fixed to. the sight and supported by the wedge.

9. The combination of a range-corrector, consisting of a wedge having a curved surface, a sight supported by the wedge, a pivot about which the sight is free to turn means for moving the wedge toward and away curved surface, an

from the pivot, and means for varying the distance between the pivot and the point of support.

10. The combination of a rangev-corrector, consisting of a Wedge having a curved surface, a sight, a pivot about which the sight is free to turn means for moving the wedge to' ward and away from the pivot, an arm fixed to the sight and supported by the wedge, and

of the distance of the object viewed, a'range-; corrector, .consistin of a wedge having a means for causing the: moving part to turn the wedge about an axis;

at right angles to its edge.

13. The combination of gurved surface, a screw, carried by the wedge a nut engag ng with the screw, and means for driving the screw .trom the moving part;

14. The combination of a vrange-finderi having in it a part which moveswith changes of the distance of the object-viewed, a range-' correct-or, consisting oi a wedge having a curved surface, a screw, carried by the wedge a nut engaging with the screw, a second screw, a friction-wheel mounted as a nut on having in it a part which. moves with changes of the distance of the object viewed, a rangecorrector, consisting of a wedge having a curved surface, means for causing the moving part to move the wedge longitudinally in a straight line, and a variablespeed. motor driving the moving part.

16. The combination of a range-finder guide.

having in it a part which moves with changes a range finder having in it a part which moves with changes of the distance of the object viewed, a range-i corrector, consisting of a wedge having asco'pic arm restin on the wedgp of the distance of the object viewed, a rangecorrector, consisting of a wedge having a curved surface, means for causing the mov ing part to turn the wedge about an axis at right angles to its edge, and a variable-speed motor driving the moving part.

17. The combination of a ran e e finderhaving in it a part which moves wit changes of the distance of the object viewed, a rangecorrector, consisting of a wedge having a curved surface, a screw, carried by the wed e a nut engaging with the screw, means for driving the screw from the moving part, and a variable-speed motor driving the moi ing part. I

18. The combination of a range {finder having in it a part Which-moves with changes of the distance of the object viewed, a rangecorrector, consisting of a wedgehaving a curved surface, a screw, carried by.- the wedge a nut engaging with the screw, a secon it, means causing the movement of the nut on the screw 'to move one end of the wedge transversely, a disk in contact with the friction wheel, a constant-speed motor driving the disk, means for driving the two screws from the moving part, and a variable speed motor driving the moving part.-

19. The combination of a gun, a guide arallel, to the gunand turning with it, a b ock free to move in the guide, a sight carried by the block, a slide free to move in the guide, a screw carried by the slide, a nut gearing with the screw, a wedge carried by the slide, and an arm connected to the block and resting on the wedge.

'ond screw, a frictionwheel mounted as-a nut i 20. The combination of a gun, a guide parallel to the gun and turningwith it, a block free to move in the guide, a sight carried by the block, a slide free to move in the guide, a

'; screw carried by the slide, a nut gearing with the screw, a i edge carried by the slide, a teleand having one menibenfixed to the bloc and a link pivoted to the other member and to the guide.

21. The combination of a gun, a guide arallel to the gun and' turning with it, a b ock free to move in the guide, a sight carried by the block, a slide. free to move in the guide, a' screw carried by the slide, a nut gearing with the screw, a Wedge pivoted to the slide, and an arm connected to the blocka nd restingon the wedge.

22. The combination of a gun, a guide ar allel to the gun and turning with it, a b ock I free to move in the guide, a sight carried by the block, a slide free to move in the guide, a

seonic air the wedge trmisversely, a disk in Contact with the friction-wheel. and a c(uistmii-spee l motor driving the disk.

24. The combination of a gun, or guide pin'- i5 nllel to the gun and turning with it. n block tree to move in the guide, a sight curried by jne block, 11 slideiree to move in the guide, a

screw carried by the slide, sjnut gear ng with the screw, 5, wedge pivoted to' the sihlv fl telen resting on the wedge and having one member fixed to the block, it link pivoted to the other member and to the guide, u trivtion-wheel mounted as anut on "the ruwrrw, means causing the movement oil the nut on thrscrew to more one end ol" the wedge transversely, a disk in contact with the filiti )li wiwcl, and it consiunt-specd motor d iving the disk.

25. The combination of at gun, ngnidrpurdiel to the gun and turning with it, a block to move in the guide, sight carried by block, a slide free to move in the guide, a srrcw carried by the siide, rut

the wed e, a nut carried by die block, a screw gearing with this nut, a second nut on this screw, a pointer carried by it, :1. cylindrical scale free to turn about its axis, readbv the .go pointer and having in it a cam-groove, and

free to move in the uide a si ht carried bv L h I F he block, a slide free to move in the guide, =1 screw carried by the slide, a nut gearing with the screw, a wedge carried by the slide, a lelescopic arm resting on the wedge and hav- 5o ing one member fixed to the block, a link pivoted to the other member and to the guide, u out carried by the block, a screw gearing with ihis nut, a second nut on this screw, it poii'iter carried by it, a cylindriczilscale free to turn ;5 about its axis, read by the pointer and having in it a, cam-groove, and pin on the slide engaging with the cam-groove.

27. The combination of a gun, a guide parallel to the gun and turning with it, a block free to move in the guide, a, sight carried by the block, a slide. free to move in the guide, a screw carried by the slide, a nut geuringwith the screw, a wedge pivo d to the slide, an arm connected to the block. and resting on the wedge, a nut carried by the bloc la, a screw gearing with this nut, i1 second nut on this screw, a pointer curried 3; it, a cylindririd scale free to turn about iis :l-XlS, read by the poin er and having in itgi cnm-groove, and a pin on. the slide engaging with the can1- glmWO.

2B. The combination (at n gun, a guide pan ullcl to the gun and turning with it, a block free to move in the guide, it sight carried by the block, a slide free to move in the guide, it screw carried by the slide, it nut gearing with the screw, wedge pivoted to the slide, it elem-epic urm resting on the wedge and luivi g one member lixed to the block. a link pivoted to the otherinrn'iber and totheguide, :i nut carried by the block, :1 screw gearing wing with .2 screw. a wedge Pdllktl by the slide, 2H1 arm connected to the block and resting-on a second nut on this screw, it order carried by ii, :1 cylindrical scale tree is turn about its axis, read by the pointer zmd having in it n; cunngroove, and a pin on the slide engn 'iu with the cam-groove.

2%). rmr caution of u gun, a guide purllel to lln" gun and iur with it, a block rec to more in the guide. it sight carried by he block, a slide l'rerin move in the guide, a screw carried by the slide, a nut gearing with the screw, it \vedgcpivoted to the slide, an urin connected lo the block nnd resting on the wedge, a l'rirtion-wheel mUUHUd us a nut on lbe srreu means musing the movement of the nut on ilu screw to move one end oi the wedge trznisvnrseiy, I cont-ix"; with ilielrictio-n-wlwel, a co. tor drivingthc disk, a nu? curried by the block, a screw gearing with this nut, li second nut on this screw, a pointer re ricd byii cvlindriczil scale free to turn about its axis, read by the pointer and having in it a, cumgroove, and a pin on the slide engaging with the cam-groove.

30. The combination of zigun, :1 guid zillci to the gun and turning with it, :1 free to move in the guide at sight (721 'i the l'iiock, it slide free to move in the gu \ie screw carried by the slide, u nut ring the screw, a: wedge pivoted to the slide, a to scopic arm resting on thrwedge, and having one member lixed to the block, a link pivoted to the other member and to the guide, it trim tion-whcel mounted as a nut on the screw, means causing the movement of the nut on the screw to move one end of the wedge tunsverscly, a disk in contact with th friction-wheel, it constant-speed motor driving the disk, a nut carried by the block, 21, screw gearing with this nut, :1. second nut on this screw, a pointer carried by it, iL cylindrical scale'free to turn about its axis, read by the pointer and having in it a cam-groove, and a this mu.

31. The combination of a gun, a guide parallel t0 the gun and turning with it, a block ;free to move in the guide, a sight carried by l the block, a slide free to move in the guide, a screw carried by the slide, a nut gearing with pin on the slide engaging with the cmn-groove..

the screw, a Wedge carried by the slide, an arm connected to the block and resting on the wedge, a nut carried by the block, a screw gearing with this nut, a second nut on this screw, a pointer carried by it, a cylindrical scale free to turn about its axis, read by the pointer and having in it a cam-groove, a pin on the slide engaging with the cam-groove, a range-finder havin in it a part which moves with changes of t e distance of the object viewed, a variable-speed motor driving the moving part, and means operated by the moving part for turning the first-mentioned screw.

32. The combination of a gun, a guide arallel to the gun and turning with it, a b ock free to move in the guide, a sight carried by the block, a slide free to move in the guide, a screw carried by the slide, a nut gearing with the screw, a Wedge carried by the slide, a telescopic arm restin on the wedge and having one member fixe to the block, a link ivoted to the other member and to the gui e, a nut carried by the block, a screw gearing with this nut, a second nut on this screw, a pointer carried by it, a cylindrical scale free to turn about its axis, read by the pointer and having in it a cam-groove, a pin on the slide engaging with the cam-groove, a range-finder having in it a part which moves with changes of the distance of the object viewed, a variablespeed motor driving the moving part, and

means operated by the moving part for turn ing the first-mentioned screw.

33,. The combination of a gun, a guide ar allel to the gun and turning with it, a b ock free-to move in the guide, a sight carried by the block, a slide free to move 1n the guide, a screw carried by the slide, a'nut gearin with the screw, a wedge pivoted to the sli e, an arm connected to the block and resting on the wedge, a nut carried by the block, a screw gearing with this nut, a second nut on this screw, a pointer carried by it, a cylindrical scale free to turn about its axis, read by the pointer and having in it a cam-groove, a pin on the slide engaging with the cam-groove, a range-finder havin in it a part which moves with changes of the distance of the object viewed, a variable-speed motor driving the moving part, and means operated by the moving part for turning the first-mentioned screw.

34. The combination of a gun, a guide arallel to the gun and turning with it, a b ock free to move in the guide, a. sight carried by the block, a slide free to move in the guide, a screw carried by the slide, a nut gearin with the screw, a wedge pivoted to the slide, a

telescopic arm resting on the wedge and having one memberfixed to the block, a link ivoted to the other member and to the gui e, a

nut carried by the block, a screw gearing with this nut, a second nut on this screw, a pointer carried by it, a cylindrical scale free to turn in it a cam-groove, a pin on the slide engag- -,ing with the cam-groove, a range-finder having in it a part which moves with changes ol. thedistanceof the object viewed, a vanablcspeed motor driving the moving part, and means 0 erated by the moving part for turning the stmentioned screw.

35. The combination of a gun, a guide arallel to' the gun and turning with it, a b ock free to move in the guide, a sight carried by the block, a slide free to move in the guide, a screw carried by the slide, a nutearing with the screw, a wedge pivoted to t e sli e, an arm connected to the block and resting on the Wedge, a friction-wheel mounted as a nut on the screw, means causing the movement of the nut on the screw gte move one end of the wedge transversely, a disk in contact with the friction-wheel, a constant-speed motor driving the disk, a nut carried by the block, a screw gearing with this nut, a second nut on this screw, a pointer carried by it, a

36. The combination of a gun, a guide ari allel to the gun and turning with it, a b ock free to move in the guide, a sight carried by the block, a slide free to move in the, guide, a screw carried by the slide, a nut gearin with the screw,- a wedge pivoted to the s de, a telescopic arm restin on the wedge, and having one member fixe "to the block, a link ivoted to the other member and to the guid friction wheel mounted asa nut on the screw, means causing the movement of the nut on the screw to move one end of the wedge transversely, a disk in contact with the friction-Wheel, a constant-speed motor driving the disk, a nut carried by the block, a screw gearing with this nut, a second nut on this screw, a pointer carried by it, a'cylindrical scale free to turn about its axis, read by the pointer and having in it a cam-groove, a pin on the slide engaging with the cam-groove, a ran e-finder having in it a part which moves wit changes of the distance of the object viewed, a variable-speed motor driving the moving part, and means operated by the moving part for turning the first-mentioned screw.

GEORGE FORBES.

Witnesses:

H. D. JAMESON, F. L. RAND.

rio 

